From: Hugh Dickins <hugh@veritas.com>
Date: Tue, 19 Apr 2005 20:29:20 +0000 (-0700)
Subject: [PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8462e201756dd3bbe7e542106fc6fd6fe059cee2;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR

Remove use of FIRST_USER_PGD_NR from sys_mincore: it's inconsistent (no other
syscall refers to it), unnecessary (sys_mincore loops over vmas further down)
and incorrect (misses user addresses in ARM's first pgd).

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/mincore.c b/mm/mincore.c
index 07833dc5829d..72890780c1c9 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -118,9 +118,6 @@ asmlinkage long sys_mincore(unsigned long start, size_t len,
  	if (start & ~PAGE_CACHE_MASK)
 		goto einval;
 
-	if (start < FIRST_USER_PGD_NR * PGDIR_SIZE)
-		goto enomem;
-
 	limit = TASK_SIZE;
 	if (start >= limit)
 		goto enomem;